From 304240f263cfbd9d9fae72d3b813afa12326ac31 Mon Sep 17 00:00:00 2001
From: Matthew Chen <matthew@signal.org>
Date: Mon, 23 Jul 2018 09:33:06 -0400
Subject: [PATCH] Fix concurrency in contacts updater.

---
 SignalServiceKit/src/Contacts/ContactsUpdater.m | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/SignalServiceKit/src/Contacts/ContactsUpdater.m b/SignalServiceKit/src/Contacts/ContactsUpdater.m
index 002f97cf6..4fa4ddb79 100644
--- a/SignalServiceKit/src/Contacts/ContactsUpdater.m
+++ b/SignalServiceKit/src/Contacts/ContactsUpdater.m
@@ -53,7 +53,7 @@ NS_ASSUME_NONNULL_BEGIN
 {
     if (identifiers.count < 1) {
         OWSFail(@"%@ Cannot lookup zero identifiers", self.logTag);
-        dispatch_async(dispatch_get_main_queue(), ^{
+        DispatchMainThreadSafe(^{
             failure(
                 OWSErrorWithCodeDescription(OWSErrorCodeInvalidMethodParameters, @"Cannot lookup zero identifiers"));
         });
@@ -65,12 +65,12 @@ NS_ASSUME_NONNULL_BEGIN
             if (recipients.count == 0) {
                 DDLogInfo(@"%@ in %s no contacts are Signal users", self.logTag, __PRETTY_FUNCTION__);
             }
-            dispatch_async(dispatch_get_main_queue(), ^{
+            DispatchMainThreadSafe(^{
                 success(recipients.allObjects);
             });
         }
         failure:^(NSError *error) {
-            dispatch_async(dispatch_get_main_queue(), ^{
+            DispatchMainThreadSafe(^{
                 failure(error);
             });
         }];